Circuit board is widely used and all kinds of electronic products, any electronic products are inseparable from the installation and use of a circuit board, in these electronic products we need a certain circuit board to ensure the normal operation of an electronic product.
So our circuit boards also have some relatively fine classification, according to the number of orders, circuit boards can be divided into three categories: single-sided double-sided circuit boards and multi-layer circuit boards. The threads are concentrated on one side and on the other, especially on assembled PCB parts. So, this is just thread, and this circuit board PCB connector is called. They are usually simple, and the side plates are cheap to make, unused, and the drawbacks of the new product are too complex.
The double panel extension plate is on one side. When single-layer wiring cannot meet the needs of electronic products, double-sided circuit boards should be used. The lines in the air are clothed, and they pass through the holes on the sides, through which the battle lines and the network connections able to form between the two become necessary. Multilayer refers to the printed board model, where the three sequences are stacked with more conductive and insulating materials at regular intervals and connected to each other. One is to err on the side of multiple layers of electronic development within the Arabic Department office that are attracted to smaller or smaller members.
Because of the small size and complex structure of the circuit board, it is necessary to use special observation equipment to observe the circuit board. Normally, a mobile video microscope is used to observe the structure of the circuit board, but with a video microscope, the circuit sensitive microscope can be clearly seen from the microscope. This makes it easier to design and test circuit boards.
The production process of these circuit boards is definitely not a few products that can be produced at a moment's notice. This is after a series of design, research and finally formal production, because these circuit boards are also a key means of electronic products, so the production process of circuit boards is indeed a little complex.
pcb circuit board how to judge good or bad
With the rapid development of mobile phone, electronics, communication industry, but also promote the PCB circuit board industry continues to expand and rapid growth, people for the components of the layer, weight, precision, materials, color, reliability and other requirements are increasingly high.
However, due to the fierce price competition in the market, the cost of PCB board materials is also on the rise. In order to improve the core competitiveness, more and more manufacturers monopolize the market with low prices. However, behind these ultra-low prices, is to reduce the cost of materials and production costs to obtain, but the device is usually prone to cracks (cracks), easy scratches, (or bruises), its precision, performance and other comprehensive factors are not up to standard, seriously affecting the use of products on the weldability and reliability and so on.
In the face of a variety of PCB circuit boards on the market, the identification of PCB circuit boards can be started from two aspects:
The first way is to judge by appearance;
On the other hand, it is judged from the quality specification requirements of PCB board itself.
The method of judging the quality of PCB circuit board
Distinguish from the appearance of the circuit board good or bad
In general, the appearance of PCB circuit boards can be analyzed and judged from three aspects:
Standard rules for size and thickness
The thickness of the circuit board to the standard circuit board is different sizes, customers can measure and check according to their own product thickness and specifications.
Light and color
External circuit boards are covered with ink, circuit boards can play the role of insulation, if the color of the board is not bright, less ink, insulation board itself is not good.
Due to more parts of the circuit board, if the welding is not good, parts easy to fall off the circuit board, seriously affect the welding quality of the circuit board, good appearance, careful identification, the interface is very important.
High-quality PCB boards need to meet the following requirements
The telephone should be easy to use after the components are installed, that is, the electrical connection should meet the requirements;
Line width, line thickness, line distance meet the requirements, so as to avoid line heating, open circuit, and short circuit;
High temperature copper skin is not easy to fall off;
The surface of copper is not easy to oxidize, which affects the installation speed.
No additional electromagnetic radiation;
The shape is not deformed, so as to avoid the deformation of the shell and dislocation of the screw hole after installation. Now are mechanized installation, circuit board hole location and line and design deformation error should be within the allowable range;
And high temperature, high humidity and special environment should also be considered in the range;
The mechanical properties of the surface should meet the installation requirements;
The above is the PCB circuit board judge good or bad method, hope to provide you with help.